package com.gzdh.device.security;

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

import com.gzdh.device.config.TokenManager;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.web.authentication.www.BasicAuthenticationFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

public class TokenAuthFilter extends BasicAuthenticationFilter {

    private TokenManager tokenManager;
    private RedisTemplate redisTemplate;

    public TokenAuthFilter(AuthenticationManager authenticationManager, TokenManager tokenManager, RedisTemplate redisTemplate) {
        super(authenticationManager);
        this.tokenManager = tokenManager;
        this.redisTemplate = redisTemplate;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
        //获取当前认证成功用户权限信息
        UsernamePasswordAuthenticationToken authRequest = getAuthentication(request);
        //判断如果有权限信息，放到权限上下文中
        if (authRequest != null) {
            SecurityContextHolder.getContext().setAuthentication(authRequest);
        }
        //放行操作
        chain.doFilter(request, response);
    }

    /**
     * 获取权限方法
     *
     * @param request
     * @return
     */
    private UsernamePasswordAuthenticationToken getAuthentication(HttpServletRequest request) {
        //从header获取token
        String token = request.getHeader("Authorization");
        if (token != null) {

            //从token获取用户名
            String username = tokenManager.getUserInfoFromToken(token);
            //从redis获取对应权限列表
            JSONArray jsonArray = JSONArray.parseArray((String) redisTemplate.opsForValue().get("sys:userrole:" + username));
            assert jsonArray != null;
            List<String> permissionValueList = jsonArray.toJavaList(String.class);
            System.out.println(permissionValueList.toString());
            Collection<GrantedAuthority> authority = new ArrayList<>();
            for (String permissionValue : permissionValueList) {
                SimpleGrantedAuthority auth = new SimpleGrantedAuthority(permissionValue);
                authority.add(auth);
            }
            return new UsernamePasswordAuthenticationToken(username, token, authority);
        }
        return null;
    }

}

